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  • Question

  • In an n-p-n transistor biased for operation in forward active region


  • Options
  • A. emitter is positive with respect to base
  • B. collector is positive with respect to base
  • C. base is positive with respect to emitter and collector is positive with respect to base
  • D. none of the above

  • Correct Answer
  • base is positive with respect to emitter and collector is positive with respect to base 

    Explanation
    In forward active mode emitter base junction is forward biased and base collector junction is reverse biased.

    More questions

    • 1. The power requirements of a DRAM in active and stand by modes is about

    • Options
    • A. 350 mW and 5 mW respectively
    • B. 350 mW each
    • C. 5 mW each
    • D. 350 mW and 100 mW respectively
      • Discuss
    • 2. The different access methods which permit many satellite users to operate in parallel through a single transponder without interfering with each other as

    • Options
    • A. Frequency Division Multiple Access (FDMA)
    • B. Time Division Multiple Access (TDMA)
    • C. Code Division Multiple Access (CDMA)
    • D. All of the above
      • Discuss
    • 3. Match the following:

      List I List II
      A. T (Reflection coefficient) = 0 1. (ZL - Zo)/(ZL + Zo)
      B. T = - 1 2. ZL = Zo
      C. T = + 1 3. ZL = 0
      D. - 1 < T < + 1 4. ZL = ?


    • Options
    • A. A-2, B-3, C-4, D-1
    • B. A-2, B-4, C-1, D-3
    • C. A-1, B-2, C-3, D-4
    • D. A-3, B-2, C-4, D-1
      • Discuss
    • 4. Assertion (A): Ferromagnetic materials possess ferromagnetic properties only when temperature is less than paramagnetic curie temperature.

      Reason (R): For a ferromagnetic material for T > ?f.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 5. Bode magnitude plot is drawn between

    • Options
    • A. magnitude of network function and ?
    • B. dB magnitude and log ?
    • C. dB magnitude and ?
    • D. loge (magnitude) and log ?
      • Discuss
    • 6. A two branch parallel circuit has a 20 ? resistance and 1 H inductance in one branch and a 100 ?F capacitor in the second branch. It is fed from 100 V ac supply, at resonance, the input impedance of the circuit is

    • Options
    • A. 500 ?
    • B. 50 ?
    • C. 20 ?
    • D. 5 ?
      • Discuss
    • 7. The temperature coefficient of a thermistor

    • Options
    • A. is positive
    • B. is negative
    • C. zero
    • D. may be positive or negative depending on its composition
      • Discuss
    • 8. An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a

    • Options
    • A. sine wave
    • B. square wave
    • C. triangular wave
    • D. (a) or (c)
      • Discuss
    • 9. In the figure shown, A1, A2, A3 are identical Ammeters. If A1 and A3 read 5 and 13 A respectively, reading of A2 will be

    • Options
    • A. 8
    • B. 13 A
    • C. 18
    • D. 12 A
      • Discuss
    • 10. A relaxation oscillator uses

    • Options
    • A. tunnel diode
    • B. UJT
    • C. both tunnel diode and UJT
    • D. PIN diode
      • Discuss

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